<template>
  <!-- 推荐和最新的切换导航 -->
  <div class="article-page">
    <nav class="my-nav van-hairline--bottom">
      <a
  @click="changeSorter('weight_desc')"
  :class="{ active: sorter === 'weight_desc' }"
  href="javascript:;"
  >推荐</a
>
<a
  @click="changeSorter(null)"
  :class="{ active: sorter === null }"
  href="javascript:;"
  >最新</a
>
      <div class="logo"><img src="@/assets/logo.png" alt="" /></div>
    </nav>

    <!-- 面经列表数据对应的每一行: 将来会获取面经列表数据，遍历创建ArticleItem -->
    <van-list
      v-model="loading"
      :finished="finished"
      finished-text="没有更多了"
      @load="onLoad"
    >
      <ArticleItem
        v-for="item in articles"
        :key="item.id"
        :item="item"
      ></ArticleItem>
    </van-list>
  </div>
</template>

<script>
import { getArticleList } from '@/api/article'
export default {
  name: 'article-page',
  data () {
    return {
      articles: [],
      current: 1,
      sorter: 'weight_desc',
      loading: false,
      finished: false
    }
  },
  methods: {
    // 上拉到底时触发的加载数据的方法
    async onLoad () {
      console.log('此时，可以发请求获取下一页数据')

      // 获取面经列表数据
      const res = await getArticleList({
        current: this.current,
        sorter: this.sorter
      })
      console.log(res)
      // 接收服务返回的数据
      // this.articles = res.data.rows
      // 把下一页的数据，拼接到上一页数据的后面
      this.articles.push(...res.data.rows)
      // 手动的将加载状态修改为未加载fatse
      this.loading = false
      // 页码+1，加载下一页
      this.current++

      // 判断数据是否都加载完，没有更多了
      if (this.current > res.data.pageTotal) {
        this.finished = true
      }
    },
    changeSorter (value) {
      this.sorter = value

      // 重置所有条件
      this.current = 1 // 排序条件变化，重新从第一页开始加载
      this.articles = []
      this.finished = false // finished重置，重新有数据可以加载了
      // this.loading = false

      // 手动加载更多
      // 手动调用了加载更多，也需要手动将loading改成true，表示正在加载中（避免重复触发）
      this.loading = true
      this.onLoad()
    }
  }
  // 一旦data节点的数据挂载到Vue实例时，自动调用，发起Ajax请求
  // async created () {
  // }
}

</script>

<style lang="less" scoped>
.article-page {
  margin-bottom: 50px;
  margin-top: 44px;
  .my-nav {
    height: 44px;
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    z-index: 999;
    background: #fff;
    display: flex;
    align-items: center;
    > a {
      color: #999;
      font-size: 14px;
      line-height: 44px;
      margin-left: 20px;
      position: relative;
      transition: all 0.3s;
      &::after {
        content: '';
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
        bottom: 0;
        width: 0;
        height: 2px;
        background: #222;
        transition: all 0.3s;
      }
      &.active {
        color: #222;
        &::after {
          width: 14px;
        }
      }
    }
    .logo {
      flex: 1;
      display: flex;
      justify-content: flex-end;
      > img {
        width: 64px;
        height: 28px;
        display: block;
        margin-right: 10px;
      }
    }
  }
}
.article-item {
  .head {
    display: flex;
    img {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      overflow: hidden;
    }
    .con {
      flex: 1;
      overflow: hidden;
      padding-left: 10px;
      p {
        margin: 0;
        line-height: 1.5;
        &.title {
          width: 280px;
        }
        &.other {
          font-size: 10px;
          color: #999;
        }
      }
    }
  }
  .body {
    font-size: 14px;
    color: #666;
    line-height: 1.6;
    margin-top: 10px;
  }
  .foot {
    font-size: 12px;
    color: #999;
    margin-top: 10px;
  }
}
</style>
